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s； we feel it to be double because the fingers are not in their customary positions and hence give double results。 From one point of view this double feeling is correct； but when we touch the pea naturally； experience helps us to feel only one pea。 Another example consists in crossing the hands and turning them inward and upward； so that the left fingers turn to the left and the right fingers to the right。 Here the localization of the fingers is totally lost； and if a second person points to one of the fingers without touching it； asking you to lift it； you regularly lift the analogous finger of the other hand。 This shows that the tactile sense is not in a very high stage of development； since it needs； when unhelped by long experience； the assistance of the sense of sight。 Perceptions through touch alone； therefore； are of small importance； inferences are made on the basis of few and more coarse characteristic impressions。
This is shown by a youthful game we used to play。 It consisted of stretching certain harmless things under the tablea soft piece of dough； a peeled； damp potato stuck on a bit of wood； a wet glove filled with sand； the spirally cut rind of a beet； etc。 Whoever got one of these objects without seeing it thought he was holding some disgusting thing and threw it away。 His sense of touch could present only the dampness； the coldness； and the motion； i。 e。； the coarsest traits of reptilian life； and the imagination built these up into a reptile and caused the consequent action。 Foolish as this game seems； it is criminalistically instructive。 It indicates what unbelievable illusions the sense of touch is capable of causing。 To this inadequacy of the tactile imagination may be added a sort of transferability of certain touch sensations。 For example； if ants are busy near my seat I immediately feel that ants are running about under my clothes； and if I see a wound or hear it described； I often feel pain in the analogous place on my own body。 That this may lead to considerable illusion in excitable witnesses is obvious。
Finally； this dependence of the sense of touch may be supplemented by the fact that it is counted only relatively； and its value varies with the individual。 We find the cellar warm in winter and cold in summer； because we only feel the difference with the outer air； and when we put one hand in hot； and the other in cold water； and then put both in tepid water one finds the tepid water cold； the other warm。 The record of tactile sensations is frequent in our protocols and requires constant consideration of the sense's unreliability。
Diseased conditions are of course to be referred to the physician。 I need only mention that slight poisonings by means of chloroform； morphine； atropine； daturine； decrease； and that strychnine increases the sensitivity of the touch organ。
Section 102。 （5） _Illusions of the Sense of Taste_。
Illusions of taste are of importance for us only in cases of poisoning in which we want the assistance of the victim； or desire to taste the poison in question in order to determine its nature。 That taste and odor are particularly difficult to get any unanimity about is an old story； and it follows that it is still more difficult clearly to understand possible illusions of these senses。 That disease can cause mistaken gustatory impressions is well known。 But precedent poisoning may also create illusions。 Thus； observation shows that poisoning by rose…santonin （that well…known worm remedy to which children are so abnormally sensitive） causes a long…enduring； bitter taste； sub…cutaneous morphine poisoning causes illusory bitter and sour tastes。 Intermittent fevers tend to cause； when there is no attack and the patient feels comparatively well； a large number of metallic； particularly coppery tastes。 If this is true it may lead to unjustified suspicions of poisoning； inasmuch as the phenomena of intermittent fever are so various that they can not all be identified。
Imagination makes considerable difference here。 Taine tells somewhere of a novelist； who so graphically described the poisoning of his heroine that he felt the taste of arsenic and got indigestion。 This may be possible； for perhaps everybody has already learned the great influence of the false idea of the nature of a food。 If some salt meat is taken to be a sweet pastry； the taste becomes disgusting because the imaginary and the actual tastes seem to be mixed。 The eye has especial influence； and the story cited and denied a hundred times； that in the dark； red wine and white wine； chicken and goose； can not be distinguished； that the going out of a cigar is not noted； etc。； is true。 With your eyes closed it may be possible to eat an onion instead of an apple。
Prior tastes may cause significant gustatory illusions。 Hence； when assertions are made about tastes； it is always necessary to inquire at the outset what had been eaten or drunk before。 Experienced housewives take this fact into consideration in setting their tables and arranging their wines。 The values of the wines are considerably raised by complete illusions of taste。 All in all； it must not be forgotten that the reliability of the sense of taste can not be estimated too low。 The illusions are greatest especially when a thing has been tasted with a preconceived notion of its taste。
Section 103。 （6） _The Illusions of the Olfactory Sense_。
Olfactory illusions are very rare in healthy people and are hence of small importance。 They are frequent among the mentally diseased； are connected in most cases with sexual conditions and then are so vivid that the judge can hardly doubt the need of calling in the physician。 Certain poisons tend to debauch the olfactory sense。 Strychnine； e。 g。； tends to make it finer； morphine duller。 People with weak lungs try； in most cases； to set their difficulty of breathing outside themselves and believe that they are inhaling poisoned air； coal…gas； etc。 If one considers in this connection the suspiciousness which many people suffering from lung trouble often exhibit； we may explain many groundless accusations of attempted murder by stifling with poisonous or unbreathable gas。 If this typical illusion is unknown to the judge he may find no reason for calling in the physician and theninjustice。
The largest number of olfactory illusions are due to imagination。 Carpenter's frequently cited case of the officials who smelled a corpse while a coffin was being dug up； until finally the coffin was found to be empty； has many fellows。 I once was making an examination of a case of arson； and on approaching the village noted a characteristic odor which is spread by burned animals or men。 When we learned： that the consumed farm lay still an hour's ride from the village； the odor immediately disappeared。 Again； on returning home； I thought I heard the voice of a visitor and immediately smelled her characteristic perfume； but she had not been there that day。
Such illusions are to be explained by the fact that many odors are in the air； that they are not very powerfully differentiated and may hence be turned by means of the imagination into that one which is likely to be most obvious。
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